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Topic: Traces width
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Maurizio Di Cintio
Jedi Master Film Handler
Posts: 977
From: Ortona, Italy
Registered: Jan 2004
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posted February 08, 2004 03:02 PM
After reading the reply to another post of yours, I actually understood what you mean: are the sound heads smaller than the soundstripes?
To the best of my knowledge the answer is: this is almost irrelevant under the point of view of sound heads performance: in fact the S/8 gauge has inherent tolerances that, should the sound head be a hair less wide than the stripe, this would compensate the fact that film always presents a certain degree of breath widthwise. Were it not this the case, the film would get stuck to the various film guides. This is something impossible to occur in reel to reel tape recorders, because magnetic tape is much more elastic than movie film and adapts itself to more srtringent tolerances without problems.
I think sound heads in S/8 prj's are a little less wide than the stripes themselves but I don't think there international standards: on some Eumig sound heads of early series (700's), probably manufactured by the German based firm Woelke in Munchen, the balance stripe head has the same width as the main stripe head. This, I guess, while not affecting performances in terms of high frequency output, enables the system to really exploit the stripe in its entire width. Ture there is a loss of magnetic energy flowing from the gap during recording, but that only results in an output signal a little weaker than expected, which , in any case, can be compensated for electronically.
But why are you interested in this, if I may ask?
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Maurizio
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